Operating mechanism for chimney-dampers



Patented- Sept. 20,. I898.

F. M. CLOTWOBTHY.

OPERATING MECHANISM FOR CHIMNEY DAMPERS.

(Application filed Nov. 27, 1897.)

(No Model.)

WITNEE5EE No. 61!,057. Patented Sept. 20, I898. F. M. CLOTWDRTHY.

OPERATING MECHANISM FOR CHIMNEY DAMPERS.

(Application filed Nov. 27, 1897.) (No Model.) 2 Sheets-Sheet 2* J m n "WI TNEEEEE QMX/ %M/J/ Nrrnn STATES PATENT Er ca.

FRANK MATTINGLY OLOTWVORTHY, OF BALTIMORE, MARYLAND.

OPERATING M ECHANISM FOR CHIMNEY-DAM PERS.

SPECIFICATION forming part of Letters Patent No. 61 1,057, dated September 20, 1898. Application filed November 27,1897. erial No. 659,957. (No model.)

T0 at whom/it may concern: I

Be it'known that I, FRANK MATTINGLY CLoTwoRTHY, of the city of Baltimore, in the State of Maryland, have invented certain Improvements in Operating Mechanism for Chimney-Dampers, of which the following is a specification.

This invention, in common with others of its class, relates to means whereby the damper in the chimney of a steam-boiler furnace is closed in the operation of opening the furnace-door and opened again when the said door is closed, the object of the invention being to prevent as far as is possible the passage of cold air through the tubes of the boiler and over the fire and heating-surfaces of the same.

In the further description of the said invention, which follows, reference is made to the accompanying drawings, forming a part thereof, and in whicl1- Figure 1 is a front View of an ordinary steam-boiler and a portion of the chimney, which is shown partly in section,'together with the improved mechanism for opening and closing the chimney-damper. Fig. 2 is an enlarged front View of the mechanism which controls the operation of the motor, together with the weighted lever which effects the movement of a cock forming a part of said mechanism in one direction, and thereby closes the damper. Fig. 3 is a central longitudinal section of the controlling mechanism. Fig. 4 is a cross-section of Fig. 3 on the dotted line 0c :0. Fig. 5 is a cross-section of Fig. 3 on the dotted line y y. Fig. 6 is a vertical section of the motor without the controlling mechanism.

Referring now to the drawings, A represents the front of a steam-boiler of ordinary description, and B the smoke-stack or chimney.

O is the chimney-damper, fastened to the pivoted shaft a and provided with an operating-lever b and a weighted counterbalancing-lever c.

D is the cylinder of the motor, having the upper and lower heads, respectively, denoted by e and f.

E is the cylinder-piston, packed with a cup-leather g, and h the piston-rod, which extends through the upper head 6. The piston-rod is weighted, the weights which are shown in Fig. 1 being denoted by j, and their office is to keep the piston normally at or near to the bottom of the cylinder.

The motor may be seated on a shelf on the front of the boiler, as shown in Fig. 1, or suitably supported in any place in the vicinity of the boiler from which the damper may be conveniently reached by means of a chain k, which is attached to one end of the damperlever and at the other to the piston-rod.

F is a cock which controls the movement of water to and from the cylinder D. It is shown in Fig. 1 as connected by a pipe, hereinafter fully described, to the lower head of the cylinder; but it may be attached directly to the cylinder if such connection can be easily arranged. The shell of the cock has two channels m and a, leading from the inside to the faces 0 and p, and a branch channel g, which leads from the channel a to the upper surface 1". I is the pipe before alluded to as connecting the cock to the bottom head of the cylinder, and it communicates with the channel n. H is another pipe leading from the branch channel g to a source of supply of water under pressure. A third pipe J leads from the channel m to carry off to any convenient place Water which is discharged from the cylinder, as hereinafter described.

The plug or key K of the cock near to its smaller end has a way 5, which may be made to register with the branch channel q. The said plug has also a half-way 25, whereby the channels m and n may be brought into communication, and also a weighted lever L, whereby it is turned.

M is a chain ext-ending from the furnacedoor 10, to which it is attached at a point near to the hinge 1;, over a sheave N to the weighted lever L, where it is fastened by means of an adjustable collar 0. I

The upper end of the cylinder D is provided with an outlet-pipe P to carry oif any water which may pass the cup-leather packing of the piston.

The apparatus is so arranged that when the furnace-door is closed the branch channel q in the cock F is fully open, the way 5 being in alinement with it, as shown in Figs. 3 and 5, and the channels on and n are disconnected,

as shown in Fig. 4. In these conditions water will pass from the service-pipe II to under- Death the piston in the cylinder and keep the piston in its highest position, so as to slacken the chain k and allow of the damper being opened by the action of the weighted lever c. If the f urnace-door is opened, the chain M is slackened,and the weighted leverL being then unsupported will cause the key of the cock to turn until the branch channel q is closed and the channels m andn placed in communication by the half-way t. WVhen the key is in this second position, water from the cylinder will escape through the pipe I, the channel 42, the half-way t, the channel m, and the dischargepipe J, and the piston being then unsupported by water is forced down by the weights j on the piston-rod, which also serve to close the chimney-damper.

The advantage of the chain connection between the furnace-door and the weighted lever, whereby the cock key or plug is turned, consists in that the moment the f urnace-door is moved to open it the Weighted lever is allowed to act in such manner as to effect the escape of the supporting vater below the piston of the motor-cylinder and the chimneydamper begins to close.

I claim as my invention In combination with a f urnace-door and a chimney-damper, a cylinder containing a weighted piston, a chain leading from the weighted piston to the damper, a pipe which connects the lower end of the cylinder with some source of supply of water under pressure, a cock in the said pipe having a key and an operating-lever, the said key being adapted to be turned so as to admit water to the cylinder and below the piston therein, or to cut off the admission of water and at the same time allow of the escape of the piston-supporting Water in the cylinder, a chain which unites the lever of the cock to the furnace-door, and a weight on the said key-operating lever to turn the key as the furnace-door is opened, and the chain slackened, substantially as, and for the purpose specified.

FRANK M1\'l"llN(lhl CLO'llVOli'llll'.

\Vitnesses:

W M. T. HOW'ARD, WM. WOODWARD CLOUD. 

